> On Aug 18, 2016, at 12:18 PM, adelzhang via swift-users > <swift-users@swift.org> wrote: > > Why swift don't warn the type mismatch? I am woking on Xcode Version 7.3.1.
It’s an implicit type-cast. Any type `X` can always be implicitly converted to type `X?` (i.e. `Optional<X>`). —Jens
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